/Engine/Plugins/Media/MediaCompositing/Source/MediaCompositingEditor/Public/Sequencer/MediaTrackEditor.h
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FTrackEditorThumbnailPool](API\Editor\MovieSceneTools\TrackEditorThumbnail\FTrackEditorThumbnailPool) > GetThumbnailPool() const